Improvement in compositions for making imitation marble



ably dry mineral paint.

COATING OR PLASTIC.

,1, bow ea UNITED STATES PATENT OFFICE.

J OHN H. IVRIGHT, OF LOUISVILLE, KENTUOIIY.

IMPROVEMENT IN COMPOSITIONS FOR MAKING IMITATION MARBLE.

Specification forming part of Letters Patent N o. 154, [63, dated August 18, 1874; application filed June 13, 1874.

To all whom it may concern:

Be it known that I, JOHN H. WRIGHT, of Louisville, in the county of Jefferson, in the State of Kentucky, have invented a new and useful Improvement in Cements for Making Imitation Marbles, of which the following is a specification:

The invention consists of imitation marble produced from a mixture of ,ealcined gvpsum hydraulic-cement rock, sugar "oT'Iead, andalfiifi,togetheitvitli'a coloring matter, prefer- In preparing this compound I take gypsumrock, crystallized, and calcine itjnaflame-kiln until its quick-setting property is destroyed. I calcine in a similar manner hydraulic cement, but just before it is ready to be Withdrawn from the furnace I add to it sufficient copper-as to change the lime contained therein from a carbonate to a sulphate. The gypsum and cement are then drawn from the kiln, ground and bolted, and to them are added sugar of lead and alum, in about the following 1 proportions Prepared g yusps say fifty; pounds; hydraulic cemen say, ty pdunds;

sii ar oi ear say, t ree pounds; alum say, RITE-1m. These lngredients are well' JOHN H. WRIGHT.

Witnesses:

FRANK PARDON, J OHN TEXTOB.

Examiner 

